Please refer to the Images above and Product Specifications below to Ensure a proper fit. PRODUCT NUMBER AND VARIATIONS: 608059 PRODUCT TYPE: Hex Head Flange Nylon Lock Nut SIZE: Common Standard Thread Type 5/16 - 18 NOTES & DETAILS: Hustler OEM 608059 Contains A Wide Range of Usages COMMON SERIES APPLICATIONS: A Wide of Hustler Equipment MODEL FIT CHART: Models that Use 608059 Might not all be Listed - However Due to a Lack of Info. We Are Working at Listing Models that We Know Do Use it MANUELLY - If you Have any Questions Whether 608059 is the Correct Application for your Unit - feel Free to Reach out to us with a Model Number of your Unit Fastrack (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) X-ONE (Rear Discharge Only) (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) Super Z (Rear Discharge Only) (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) 930024, 930065, 932053, 932061, 934216, 934224, 935023, 935064, 936914, 936955, 940031, 940049, 941195, 941203, 942862, 942912, 943910, 943944 Super Z Hyper Drive (Rear Discharge Only) (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) 932178, 932186, 934307, 934315, 934935, 934976, 937011, 937052, 941245, 941286, 941559, 941567, 943035, 943043, 944025, 944033 Diesel Z (Rear Discharge Only) (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) Super ATZ (Rear Discharge Models) (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) No Listed Model Numbers Super 104 (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) Super S (Side Discharge Only) (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) Super SF (Side Discharge Only) (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) Super 88 (Models 2011 and Later are Listed - Models Listed Prior To 2011 Will Not Be Listed If Applicable) 936617, 939546